Time Electronics 1048 Voltage-Current-Loop Calibrator - Manual (Page 11)

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V1.2 30/12/10 P a g e | 11 1048 Technical Manual
4.
Additional Operating Modes
These modes are designed to automate and speed up the process of testing and calibration.
The STEP mode allows simplified calibration. It provides output steps of fixed value.
Three choices are available,
a) 5 point calibration; 4, 8 ,12, 16, 20 mA
b) 11 point calibration; 1,2,3,4,5,6,7,8,9,10 V
c) 21 point calibration; 1,2,3,4,5…18,19,20 mA or V
The a) and b) choices are the defaults. The c) choice is obtained by powering up the unit
while pressing the DEC button.
The RAMP mode provides a continuous ramp up/down with dwell periods at the top and
bottom. Both voltage and current are available for ramping and the ramp limits can be
selected as shown above i.e. for 5, 11 or 21 point calibrations.
SELECTING THE OPERATING MODE:
The above operating modes are selected by simultaneously pressing the INC and DEC
buttons.
Every time they are pressed the next mode will be selected.
The mode at power up is NORMAL.
This is followed by STEP, which is indicated by the ‘CONTINUITY’ legend appearing in the
top right section of the display.
The final mode is RAMP, which is indicated by the ‘CONTINUITY’ legend flashing .
4.1. STEP - Manual
Considerably speeds up the calibration process as a simple push of a button enables the
unit to manually step through standard calibration points, 5 points in 4-20, 11 points in 0-10,
or 21 points in 0-20.
• Set function switch to SRC
• Set OFF/V/mA switch to the desired units (V or mA)
• Set range switch to the desired range
• Set output switch to NORM
Simultaneously press INC and DEC buttons and the word “CONTINUITY” will appear on the
display and the reading will go to zero.
The unit is now ready to manually step through the preset values determined by the switch-
on mode stated in section 4.0 a), b) or c).
Press the INC to step to the next output value.
Press the DEC button to step back to the previous output value.
NOTES:
a) When choosing the 4 - 20 steps the initial value will be zero. It will move to 4 at the first press and
subsequently cycle between 4 and 20 in the regular 5 point pattern.
b) The output switch will operate in the same way as for source (V & mA) function.